HEATIT ET-72 Digital Programmable Thermostat User Manual

1. Introduction

The HEATIT ET-72 is a digital programmable thermostat designed for electric floor heating systems. It features a large LCD display, 7-day scheduling capabilities, and built-in Class A GFCI (Ground Fault Circuit Interrupter) protection for enhanced safety. This manual provides detailed instructions for installation, operation, and maintenance to ensure optimal performance and longevity of your thermostat.

Figure 1: Front view of the ET-72 Thermostat

2. Important Safety Information

WARNING: To reduce the risk of electric shock, do not connect to a circuit with any phase operating at more than 150 volts to ground. Installation should only be performed by a qualified electrician in accordance with local electrical codes.

• Always disconnect power at the circuit breaker before installing or servicing the thermostat.
• Ensure all wiring connections are secure and properly insulated.
• The thermostat includes a built-in Class A GFCI. It is crucial to test the GFCI function monthly as per the instructions in the Maintenance section.
• Do not expose the thermostat to water or excessive moisture.
• This thermostat is designed for electric floor heating systems only.

3. Package Contents

Verify that all items are present in your package:

• HEATIT ET-72 Digital Programmable Thermostat
• User Manual (this document)
• Floor Sensor
• Mounting Screws (2 pcs)

Figure 2: Package Contents

4. Specifications

5. Installation

Before You Begin:

• Turn off power to the heating circuit at the main electrical panel.
• Ensure you have the necessary tools (screwdriver, wire strippers, electrical tape).
• Consult a qualified electrician if you are unsure about any steps.

Wiring Instructions:

Figure 3: Dimensions and Wiring Diagram

1. Prepare Wiring: Route the electrical wires from the circuit breaker, the heating mat/cable, and the floor sensor to the thermostat's electrical box.
2. Connect Power (L1, N): Connect the Line (L1) and Neutral (N) wires from your electrical supply to the corresponding terminals on the thermostat.
3. Connect Load (LOAD L, LOAD N): Connect the Line (L) and Neutral (N) wires from your electric floor heating system to the 'LOAD' terminals on the thermostat.
4. Connect Floor Sensor (IN/SNR A, B): Connect the two wires from the floor sensor to the 'IN/SNR A' and 'IN/SNR B' terminals. Polarity is typically not critical for the sensor.
5. Secure Thermostat: Carefully push the wires into the electrical box and secure the thermostat to the wall box using the provided mounting screws.
6. Restore Power: Once all connections are secure and the thermostat is mounted, restore power at the circuit breaker.

6. Operation

The ET-72 thermostat features a touch interface for easy control. The large LCD displays current temperature, set temperature, time, and day of the week.

6.1 Basic Controls

• Power Button: Turns the thermostat ON/OFF.
• Up/Down Arrows: Adjust the set temperature or navigate menu options.
• OK Button: Confirms selections or enters menu settings.
• Mode Button: Switches between different operating modes (e.g., Auto, Manual).

6.2 Programming 7-Day Schedule

The thermostat supports 7-day scheduling with 4 or 2 stages per day. This allows you to set different temperatures for various times of the day and days of the week to optimize comfort and energy savings.

1. Enter Programming Mode: Press and hold the 'OK' button for a few seconds until the programming menu appears.
2. Select Day: Use the Up/Down arrows to select the day or group of days you wish to program (e.g., Mon-Fri, Sat-Sun, or individual days). Press 'OK'.
3. Set Stages: For each stage (e.g., Wake, Leave, Return, Sleep), set the desired time and temperature using the Up/Down arrows and 'OK' button.
4. Repeat: Repeat for all desired days and stages.
5. Exit Programming: Save changes and exit programming mode (refer to the on-screen prompts or press the 'Mode' button).

7. Sensor Applications

The ET-72 thermostat offers three sensor application modes:

• Room Mode: Controls the room temperature based solely on the thermostat's built-in ambient air sensor. The floor sensor is not used in this mode.
• Floor Mode: Controls the floor temperature based solely on the external floor sensor. This mode is ideal for maintaining a consistent floor surface temperature.
• Room Limit Mode: Controls the room temperature using the built-in sensor while simultaneously monitoring the floor temperature via the external sensor. In this mode, the floor temperature will not exceed a user-defined upper limit, preventing overheating of the floor.

You can select the desired sensor mode through the thermostat's settings menu.

8. Maintenance

8.1 GFCI Testing

It is very important to check the GFCI function monthly to ensure proper operation and continued protection against electric shock.

1. Press the 'TEST' button on the GFCI. The thermostat should immediately turn off, and an error message or indicator should appear on the display.
2. Press the 'RESET' button on the GFCI. The thermostat should resume normal operation.
3. If the GFCI does not trip or reset correctly, discontinue use of the heating system and contact a qualified electrician immediately.

8.2 Cleaning

Wipe the thermostat's surface with a soft, damp cloth. Do not use abrasive cleaners or solvents, as these can damage the display or casing.

9. Troubleshooting

10. User Tips

• For optimal energy efficiency, utilize the 7-day programming feature to match your heating schedule with your daily routine.
• Consider using the 'Room Limit' sensor mode to prevent your floor from becoming excessively hot while still maintaining comfortable ambient room temperature.
• Regularly clean the thermostat screen to ensure clear visibility and responsive touch controls.
• If you experience any issues, always try cycling the power at the circuit breaker for a few minutes before contacting support.

11. Warranty and Support

For warranty information or technical support, please refer to the contact details provided by your retailer or the manufacturer's official website. Keep your purchase receipt as proof of purchase.

12. Product Video